*{
  margin: 0;
  padding: 0;
}
html,body{
  width: 100%;
  height: 100%;
}
.root{
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
}
.App{
  width: 40%;
  border: 1px solid gray;
  display: flex;
  flex-direction: column;
  align-items: center;
}